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We compared the proportion of undiagnosed dementia, associated factors, and mortality in the United States and Brazil.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS<\/jats:title>\n                    <jats:p>\n                      This population\u2010based cohort study included adults aged \u2265\u00a065 years from the 2016 US Health and Retirement Study (\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a09,539) and the 2015\u20132016 Brazilian Longitudinal Study of Aging (\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a03603), followed for mortality through 2020. Dementia was classified as no dementia, undiagnosed dementia, or diagnosed dementia using harmonized cognitive, functional, and informant measures.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>The proportion of undiagnosed dementia was higher in Brazil (76.1%) than in the United States (45.1%). Undiagnosed dementia was associated with increased 4\u2010year mortality compared with no dementia in both countries. It was linked to younger age and absence of memory complaints, with marked socioeconomic and healthcare disparities in Brazil.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>DISCUSSION<\/jats:title>\n                    <jats:p>Undiagnosed dementia is common and associated with increased mortality, identifying a vulnerable population missed by current diagnostic pathways.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/alz.71430","type":"journal-article","created":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T02:59:16Z","timestamp":1777517956000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Undiagnosed dementia and mortality among older adults in the United States and Brazil: A cross\u2010national cohort study"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7467-1745","authenticated-orcid":false,"given":"M\u00e1rlon Juliano Romero","family":"Aliberti","sequence":"first","affiliation":[{"name":"Laboratorio de Investigacao Medica em Envelhecimento (LIM\u201066) Servico de Geriatria Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo  Sao Paulo Brazil"},{"name":"Research Institute Hospital Sirio\u2010Libanes  S\u00e3o Paulo Brazil"},{"name":"Department of Epidemiology Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University  Baltimore Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thiago J.","family":"Avelino\u2010Silva","sequence":"additional","affiliation":[{"name":"Laboratorio de Investigacao Medica em Envelhecimento (LIM\u201066) Servico de Geriatria Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo  Sao Paulo Brazil"},{"name":"Division of Geriatrics Department of Medicine University of California, San Francisco  San Francisco California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth E.","family":"Covinsky","sequence":"additional","affiliation":[{"name":"Division of Geriatrics Department of Medicine University of California, San Francisco  San Francisco California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth","family":"Lam","sequence":"additional","affiliation":[{"name":"Division of Geriatric Medicine Department of Medicine University of Colorado Anschutz Medical Campus  Aurora Colorado USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sei J.","family":"Lee","sequence":"additional","affiliation":[{"name":"Division of Geriatrics Department of Medicine University of California, San Francisco  San Francisco California 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